Regan, B, Aghajamali, A, Froech, J, Toan, TT, Scott, J, Bishop, J, Suarez-Martinez, I, Liu, Y, Cairney, JM, Marks, NA, Toth, M & Aharonovich, I 2020, 'Plastic Deformation of Single-Crystal Diamond Nanopillars', ADVANCED MATERIALS, vol. 32, no. 9.View/Download from: Publisher's site
Tran, TT, Regan, B, Ekimov, EA, Mu, Z, Zhou, Y, Gao, W-B, Narang, P, Solntsev, AS, Toth, M, Aharonovich, I & Bradac, C 2019, 'Anti-Stokes excitation of solid-state quantum emitters for nanoscale thermometry.', Science Advances, vol. 5, no. 5.View/Download from: Publisher's site
Color centers in solids are the fundamental constituents of a plethora of applications such as lasers, light-emitting diodes, and sensors, as well as the foundation of advanced quantum information and communication technologies. Their photoluminescence properties are usually studied under Stokes excitation, in which the emitted photons are at a lower energy than the excitation ones. In this work, we explore the opposite anti-Stokes process, where excitation is performed with lower-energy photons. We report that the process is sufficiently efficient to excite even a single quantum system-namely, the germanium-vacancy center in diamond. Consequently, we leverage the temperature-dependent, phonon-assisted mechanism to realize an all-optical nanoscale thermometry scheme that outperforms any homologous optical method used to date. Our results frame a promising approach for exploring fundamental light-matter interactions in isolated quantum systems and harness it toward the realization of practical nanoscale thermometry and sensing.
Duong, NMH, Regan, B, Toth, M, Aharonovich, I & Dawes, J 2019, 'A Random Laser Based on Hybrid Fluorescent Dye and Diamond Nanoneedles', physica status solidi (RRL) - Rapid Research Letters, vol. 13, no. 2.View/Download from: Publisher's site
© 2018 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim Random lasers use radiative gain and multiple scatterers in disordered media to generate light amplification. In this study, a random laser based on diamond nanoneedles that act as scatterers in combination with fluorescent dye molecules that serve as a gain medium has been demonstrated. Random lasers realized using diamond possess high spectral radiance with angle-free emission and thresholds of 0.16 mJ. The emission dependence on the pillar diameter and density is investigated, and optimum lasing conditions are measured for pillars with spacing and density of ≈336 ± 40 nm and ≈2.9 × 1010 cm−2. Our results expand the application space of diamond as a material platform for practical, compact photonic devices, and sensing applications.
Häußler, S, Benedikter, J, Bray, K, Regan, B, Dietrich, A, Twamley, J, Aharonovich, I, Hunger, D & Kubanek, A 2019, 'Diamond photonics platform based on silicon vacancy centers in a single-crystal diamond membrane and a fiber cavity', Physical Review B, vol. 99, no. 16.View/Download from: Publisher's site
© 2019 American Physical Society. We realize a potential platform for an efficient spin-photon interface, namely negatively-charged silicon-vacancy centers in a diamond membrane coupled to the mode of a fully-tunable, fiber-based, optical resonator. We demonstrate that introducing the thin (∼200nm), single crystal diamond membrane into the mode of the resonator does not change the cavity properties, which is one of the crucial points for an efficient spin-photon interface. In particular, we observe constantly high Finesse values of up to 3000 and a linear dispersion in the presence of the membrane. We observe cavity-coupled fluorescence from an ensemble of SiV- centers with an enhancement factor of ∼1.9. Furthermore from our investigations we extract the ensemble absorption and extrapolate an absorption cross section of (2.9±2)×10-12cm2 for a single SiV- center, much higher than previously reported.
Trycz, A, Regan, B, Kianinia, M, Bray, K, Toth, M & Aharonovich, I 2019, 'Bottom up engineering of single crystal diamond membranes with germanium vacancy color centers', OPTICAL MATERIALS EXPRESS, vol. 9, no. 12, pp. 4708-4715.View/Download from: Publisher's site
Bray, K, Regan, B, Trycz, A, Previdi, R, Seniutinas, G, Ganesan, K, Kianinia, M, Kim, S & Aharonovich, I 2018, 'Single Crystal Diamond Membranes and Photonic Resonators Containing Germanium Vacancy Color Centers', ACS Photonics, vol. 5, no. 12, pp. 4817-4822.View/Download from: Publisher's site
Copyright © 2018 American Chemical Society. Single crystal diamond membranes that host optically active emitters are highly attractive components for integrated quantum nanophotonics. In this work we demonstrate bottom-up synthesis of single crystal diamond membranes containing germanium vacancy (GeV) color centers. We employ a lift-off technique to generate the membranes and perform chemical vapor deposition in the presence of a germanium source to realize the in situ doping. Finally, we show that these membranes are suitable for engineering of photonic resonators such as microdisk cavities with quality factors of ∼1500. The robust and scalable approach to engineer single crystal diamond membranes containing emerging color centers is a promising pathway for the realization of diamond integrated quantum nanophotonic circuits on a chip.
Kianinia, M, Regan, B, Tawfik, SA, Tran, TT, Ford, MJ, Aharonovich, I & Toth, M 2017, 'Robust Solid-State Quantum System Operating at 800 K', ACS Photonics, vol. 4, no. 4, pp. 768-773.View/Download from: Publisher's site
© 2017 American Chemical Society. Realization of quantum information and communications technologies requires robust, stable solid-state single-photon sources. However, most existing sources cease to function above cryogenic or room temperature due to thermal ionization or strong phonon coupling, which impedes their emissive and quantum properties. Here we present an efficient single-photon source based on a defect in a van der Waals crystal that is optically stable and operates at elevated temperatures of up to 800 K. The quantum nature of the source and the photon purity are maintained upon heating to 800 K and cooling back to room temperature. Our report of a robust high-temperature solid-state single photon source constitutes a significant step toward practical, integrated quantum technologies for real-world environments.
Tran, TT, Regan, B, Ekimov, EA, Mu, Z, Yu, Z, Gao, W, Narang, P, Solntsev, AS, Toth, M, Aharonovich, I & Bradac, C 2019, 'Anti-Stokes Excitation of Solid-State Quantum Emitters for Nanoscale Thermometry', 2019 Conference on Lasers and Electro-Optics, CLEO 2019 - Proceedings.View/Download from: Publisher's site
© 2019 The Author(s) 2019 OSA. We report the first demonstration of Anti-Stokes excitation on a single solid-state quantum emitter-namely the germanium-vacancy center in diamond and its application as a high-sensitive nanoscale thermal sensor.
Tran, TT, Regan, B, Ekimov, EA, Mu, Z, Yu, Z, Gao, W, Narang, P, Solntsev, AS, Toth, M, Aharonovich, I & Bradac, C 2019, 'Anti-Stokes excitation of solid-state quantum emitters for nanoscale thermometry', Proceedings Conference on Lasers and Electro-Optics, CLEO: Science and Innovations, OSA, San Jose, California, United States.View/Download from: Publisher's site
© 2019 The Author(s) We report the first demonstration of Anti-Stokes excitation on a single solid-state quantum emitter-namely the germanium-vacancy center in diamond and its application as a high-sensitive nanoscale thermal sensor.